I crocheted for years before taking up knitting last summer. I have only used crocheted edging on a knit item twice, I think. The combination is IMO great. I expect that in days to come I'll combine the two more.
I saw your sweater and love it, love it, love it! A great example of why knitters might want to learn to crochet and crocheters might want to learn to knit.
I should never overestimate my basic arithmetic skills.